Unreal Engine Issues

Incorrect relative location on client under certain attachment conditions

An attached actor's relative location isn't correct on the client when the actor has its position changed to that of the parent actor before attaching with the "Keep World" location rule. On the cli ...

Path Tracing denoiser is not stable in animation

When rendering an animation with the path tracer through MovieRenderQueue, at low sampling rates the denoiser produces splotchy results that flicker from frame to frame. The current denoiser (Ope ...

Path Tracing - HDRIBackdrop contributing twice

The setup for HDRIBackdrop leads to double-counting of the illumination between the skydome and the geometry in the path tracer. ...

Steam Sessions fails to create when using the Create Session node

This is a Regression. 4.26.2 - Binary - no issue creating a session. 4.27.1 - Binary - no issue creating a session if you convert a previously working 4.26.2 project. 4.27.1 - Binary - Fails to c ...

MipLevel sample mode doesn't work as expected in Adaptive RVT

Multiple Blueprint compilation passes required to fix up event binding to dispatcher after event rename

Renaming a custom event bound to an event dispatcher via a Create Event node requires two compilation passes to fix up the binding.  upd. Regression was checked on //UE4/Release-4.26 CL 15973114, i ...

Audio section has incorrect duration when pitch is changed.

Sequencer determines audio duration based on the sound, which does not factor in pitch information, so the duration will be incorrect, leading to incorrect playback. ...

When playing Montage, the loop setting may slip through in rare cases.

UAnimInstance::GetInstanceTransitionTimeElapsed does NOT consider TransitionIndex

GetInstanceTransitionTimeElapsed doesn't use TransitionIndex. float UAnimInstance::GetInstanceTransitionTimeElapsed(int32 MachineIndex, int32 TransitionIndex) { // Just an alias for readabili ...

The drawing order of widgets becomes wrong when GlobalInvalidation is enabled,

When trying to create a widget with specific steps, the drawing order may not be correct. This is not reproduced when Global Invalidation is disabled, and the state can be restored. This issue is pr ...